Truck.



G. P. CLARK, W. F. IRRGANG L G. E CLARK.

TRUCK.

APPLICATION man MAR. 30. m12.

Patented Sept. T, 1915.-

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G. P. CLARK,y W. F. IHRGANG & G. E. CLARK.

TRUCK.

APPLlcATIoN FILED MAH.30.1912.

Patented Sept. T, 1915.

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APPLlcAHoN man MAR.30.1912.

G. P. CLARK, W. F. RRGANG L G. E. CLARK,

IVITNESSES:

In'. P. CLARK, W. F. IRRGANG I G. E. CLARK.

TRUCK.

APPLICATION FILED .II/III. 30, I9I2I PatentedSept. 7, 1915.

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mw. MM@ dy WE G. P. CLARK, W. ,F. IR'RGANG & G. E. CLARK.

TRUCK.

APPLICATION FILED MAR. 30, I9I2.

Patent-edSept. 7, 1915.

5 SHEETS-SHEET @wma WJNESSES:

UNITED sTATEs PATENT OFFICE.

GEORGE P. CLARK, WILLIAM F. IRRGANG, ANI) GEORGE E. CLARK, 0F WINDSOR LOCKS, CONNECTICUT, ASSIGNORS TO GEORGE P. CLARKCOMPANY, 0F WINDSOR LOCKS, CONNECTICUT, A. CORPORATION 0F CONNECTICUT. v ,f

TRUCK.

ASp'ecication of Letters Patent.

Patented Sept. 7, 1915.

Application filed March 30, 1912. Serial N o. 687,434.

. To all wit-om t may concern Be it known that we, GEORGE "P. CLARK VVILLIABI F. IRRGANG, and GEORGE E. CLARK,

citizens of the United States of America, Ie-

siding at Windsor Locks, in the county of :platform .bearing the load, then elevating the-platform, or frame, of the truck until it lifts and supports the platform holding the it as a unit in a similar manner.

load. lNhen this has been done the truck can transport the load as a unit and unload In other words, with this class of trucks it is unnecessary to load and unload material by hand.

' It has been found with trucks heretofore used that heavy loads required the operator to be exceptionally strong, heavy or skilful.-

The object of this invention is to provide a truck of the class described which does not require an operator of skill, weight or strength, but can be operated conveniently by any ordinary workman. Y

Other objects of the invention will appear in the detailed description and annexed claims. l

In the drawings: Figure 1 is a side View of the truck in position to elevate a platform. Fig. 2 is a perspective view of a portion of the elevating mechanism.I Fig. 3 is a side view partly in section ofthe truck showing the elevating mechanismun position to elevate the platform. Fig. 4 is aV similar view- Withthe same mechanism in place 'topernit the platform to Itake its lower position. Fig. 5 is a plan view ofthe mechanism shown in Fig. 2, With certain parts omitted. Fig. 6 is a section taken on line 6 6 of Fig. 5. Fig. 7 is a side view of the'triick ready for use. .Fig. 8 is a View of the platform withwhich the truck is used, showing in section the leaf springs controlling the position of the supporting legs. Fig. 9 is a partial sectional view of the supporting leg and its mounting With relation tothe controlling springs. Fig. 10 isa seetion taken on line 10-10 of Fig. 4. Fig. 11 is a section taken on line 11-11 of Fig. 3.

The general operation of the truck is as follows: If a load of any kind to be transported is on the platform 3 (F ig. 1), or if it is desired to transport the platform Without a load, the truck is rolled under -said platform; the handle t (see ig. 7) is swung "back until the pin u snaps into the hook in bar n. The handle t is then recipro'oatedback and forth, operating bar n, which in turn operates mechanism to rotate shafts w in -the frame of the truck. Cams 19, one on each end of each shaft, are turned with said shafts and these cams, operating on rollers 20 of the frame platform y, elevate the lat? 7.0

ter until it bears against and lifts the platform 3. The handle 15 is then unhooked from bar a and the truck, with platform 3 thereon, is wheeled to the desired point. If handle t isthen hooked again into bar n and worked back and forth the mechanism which before operated to elevate the truck will, by having the relation of its parts changed by other mechanism, allow the truck to take its lowermost position and allow the legs 1 and 4 of platform 3 to suppoit the latter on the floor, after Which the truck iswheeled away to`handle another "load, leaving desired.

The specific operation will now be vde? s ribed: Referring to Figs. 2, 3 and 4,' thev the platform 3 at the point A pin u, when hooked in bar n., pulls the latter back and forth as the handle t is rocked. The latter is pivoted on the supporting part r 'and as a result the operator has considerable leverage. to move bar n. This bar is connected to a rocking member 27', which in turn swings or rocks on supporting pin Z in the fixed frame 15 of the truck. To the member 27 are hinged the two-operating -Apawls d and e, one above pin' `Z andone below, at points 7' and cre'spectively. About midway of each pawl a reversing paw] is hinged. -These reversing pawls, f and z', are l seen in normal position in Fig. 3. The outer fixedframe, while the 'outer end of pawl f.

are both: shown. v'engaging the rack b; :new

ably mountedin the frame. This rackend of pawl i bears against a ,lip l1. of .the

pawls CZ and e reverse operations in an obvious manner, tl e -pawl (Z operating; as the driving` pawl and pawl e snapping haelt one tooth to opeate as the holdingk pawl. During` these driving n'ioveinents the reverse pawls niovel with the opeiatingfy pawls and act as a supporting' means therefor, whereby said operating pawls are kept in engagement with the rack. Referring: to Figs o and (i, each ot the reversingr pawls and i. have a lug thereon, to which one end ot' a spring' is fastened. Each spring is wound around the pivot pin of the reversing pa wl and connected to the eirespondingv operating pawl, giving this pawl a tendency to always remain in operative position to the rack. Vhen the handle t has been operated long enough to move the rack suliieiently for the Canis 19 to raise the truck platform y/ as far as desired, the oi'ierator p'iits his foot on the ear 30 on bar a and forces fn downwardly against spring 0. rlhe pin il, is tl as disengaged from bar y71, and the handle eau then be used to transport the truck to the desired point. lV hen it is desired to lower the truck platform 1/ after it has been elevated, the operator again foi-ees pin u against bar al (see Fig. LAi), depressing' said bar until spring 0 snaps the end hook thereof into engagement with pin il. '1l he back and forthl movementof bar n drives the rack b forwardly until the lug` 12 thereon contacts with ear 14 of the reversing lever o (see Figs. 2 and 4). The lever e roelied on its pivot point 7i and bears down on one or the other of the reversing' pawls y and i', aeeordingly as one or the other is placed in position by bar a to be depressed. iiii examination oli-Fig. 2 shows that if bai' a is in its baek position only the reversing pawl i' has one end in position to be forced downwardly when leven c is rocked as described. if bar n is in the forward position then only pa wl 7 will be in position to be depressed. Fig. -fl shows the parts in position for pawl to be depressed and since the forward end of this pawl. is supported by lip 7i the depression of the back end causes the reversing pawl to act as a lever to force the drivin;r pawl e away from the raek The weight of the truck platform hearing against the cams 1S) turns shafts /i/f and gears g to .foi-ee rauh L haekwardly. only pawl [ii is ineontaet with the rack this backward movement of the raeh will foi-ee member QT to rook eoiinte' eloehwise and move bar '2i forwardly. )it the saine time that pawl Z is moved harlwardly by the raeli its reversing pawl j" is foried into Contact with level' c and forced downwardly. thus pulling p-.iwl out of eoiitaet with the rar-li in a similar manner to the withdrawal of pawl a, already ifleseribed.

rl`he movements of the parts just desrribed will 'arr v the reversing,` pawl z' out of rontart with lever f and foirey pawl o into eontar. with the raeli. r1`he eontiiiued backward movement of the rauhy willforro pa wl (y out of eontaet and pawl i'/ into Contart with said raeh in a similar manner to that ali'ead)- deseribed. As lug' 12 is removed Vfrom Contact with ai' 1l on lever r:

'the latter is held in reversing' position by arin o, pivoted thereto and haviii;r a slot therein to rereive pin 21 (see Fig. l). The arin o normally rides on the pin 21. Whenever the arm is moved foi-'the slot to engage the pin (the spi-iii.;` 31 insures this engagement). the lever f' is held in reversingr position until ariii o is raised to disengage the slot from the pin and foree lever e to normal inoperative position. When lever f.: is iu reversingw position the pawls Il and o, as desrribed. will permit the weight of the. trui-l( platform to forcey the, Iarl ba l-:waidly step b v step, during which time the platform is lowered. pin 7 on the end of the rarl; (see Figs. i. and l) iszadapted (o engagey a lrain 9 ou Vthe arm al .to .push said ariu upwardly and bin'hwaidly to restore lever f1 to normal position. on ariii i is 'positioned at the front of the A right angle bend 9 trui-li', so that the operator eau by hand operale, the reversinglever fr into either of its two positions.

either auoiiiatieally or iiianiiallv.

With the truek and its operating nieehaiiisiu arranged as desei'ibed, it is lear that it eaii be used for all the purposes of an elevating trurlf. The mechanism provided pei'- niits a light aud weak iiiaii to get a sullieient leverage lo raise a heavy load on the truck platform, whieli he would be wholly unable ti;- do were this leveragey not possible. The ineehanis-ini is as eonvenient and operated in as simple a i'naiinei' as many ordinary lifting iaelis. rlhe lifting meehanisiii in this apparatus is, in essential parts, a forni of jack.

1n Figs. S and S) the platforn'i which is particularly adailed for use with elevating trucks is shown. llaeh leg is l'iivoteiil at one eorner of the platform and has a lug,r 18 bearingagainst two leaf springs, 1G and 1T. The horizontal bearing,r surfaee of each leg, when supporting the platform, is on one sideI of the pivot point and lug 18, arranged Pat an angle thereto, on' the other. After the platform has beenylloaded onla truck or when it is desired to rnest the plat- '.lhis lever r is thus operated forms a number of which are supplied to earh truck), the legs are folded up 'under the platform and the lug 18 passes across renter. The. springs 16 and 17 bear against the lug 1S to hold the leg into either its supporting or non-supporting position. 'As a leg is hanged from one .position to another the two springs 16 and 17 slide, one relatively to the other. With this arrangements a strong spring action is obtained without danger of snapping the spring as the lug passes'across center, as would be the rase where a single leaf spring-is used.

lVe claim:

1. The combination in an elevating truck, of a wheel supported frame, a steering handle, a platform on said frame arranged to be raised and lowered, a rack, a plurality of lifting devices operable therefrom and arranged to move said platform and means to operati` said rack backwardly or forwardly in a step by step manner, said means comrisin T a Bair of iawls, a lever and an o erating bar connected to said lever automatically engageable with said handle, said pawls arranged alternately to move said rack inastep by step manne as said handle is moved.

L.. An elevating truck, a handle, a frame, a supporting part mounted thereon arranged to be raised and lowered, a rack slidable in said frame. shafts operable from said rack, cams on saidshat'ts arranged to elevate said supporting part, operating pawls for said rack, a lever arranged to operate said pawls and a connection between said lever and said handle, all constructed and arranged so that said supporting part may be raised or lowered in a step by step manner from said handle.-

3. In a device of the class described a truck frame, a truck platform adapted to shaft bearing against the platform, a gear on each shaft, a rack meshing with. each gear, together with two operating pawls, a

lever mechanism on which the pawls are mounted, means to operate said lever mechanism, to operate the pawls one after'ethe other, as described.

4. The combination 1n an elevating truek of a Wheel supported frame, a members thereon arrangedto be raised and lowered, a, handle, a plurality' of shafts mounted in lsaid frame, cams on each of said shafts arranged to engage said member, a rack, con; nections operable therefrom to drive'eaeh of. said shafts, and means to move said rack,

backwardlyA or forwardly in a step by step-r' manner to operate said cams to raise said member, said means comprising a pair of pawls, a lever arranged to move said pawls in opposite directions, and a link Connected to said lever and automatically engageable with said handle.

5. The combination in an elevating truck of a wheel supported frame, a handle for hauling and steering said frame, a platform on saidframe arranged to be raised and lowered, a rack slidable in said frame, a plurality of cam devices operable from said rack and arranged to move said platform and means to movesaid rack baelrwardly or forwardly in a step by stepmanner, said means comprising a lever, a link connection ltherewith automatically engageable with said handle and two pawls carried by said lever arranged to move in opposite direc tions, whereby said pawls alternately act on said rack to move the latter step by step as said handle is moved. GEORGE '1). CLARK.

WILLIAM F. IRRGANG.

GEGRGE E. CLARK.

Witnesses:

GEORGE-H. DowN'roN,

NELSON L. Jarvis. 

